Cylinder for paper coating machines and the like



Dec. 22, 1931. I -c. w. MAYER 1,837,562

CYLINDER FOR'PAPE comma mdnmns'mu'rnn LIKE Filed March 16, 1929 INVENTQR Cf/ARLES W WAYEK BY j ATTORNEYS Patented Dec. 22, 1931 UNITED STATES CHARLES W. MAYER, OF ROCHESTER, NEW YORK CYLINDER FOR PAPER COATING MACHINES AND THE LIKE Application filed March 16, 1929. Serial No. 347,552.

This invention relates to improvements in cylinders to be used on paper coating machines and the like, and has particular reference to a temperature control for such cylin- I ders.

In machines employed to manufacture waxpaper or, in fact, any type of machine utilizing cooling or heating cylinders, one of the problems involved is to maintain the entire surface of the cylinder at a uniform temperature. With paper Waxing machines, for instance, the cooling cylinders, over which the coated paper is passed for the purpose of being chilled, are known to become warmer in the central portions thereof than at the ends and when this occurs the coating on the web loses the luster or shine characteristic of well prepared wax-paper and the resultant product has an irregular finish. The same is true when steam is run through heating cylinders which are utilized to impregnatethe web of paper with Wax, oil or the like.

Heretofore, cylinders have been employed in which a cooling or heating medium has been circulated through an open-ended drum mounted within the cylinder, but' although this has been found to be effective to some extent the best of results have not been obtained in maintaining the entire surface of the outer cylinder at a uniform temperature.

The present invention has been accordingly designed for the purpose of overcoming the above noted difliculty and, to this end, consists in mounting within the outer cylinder a structure which will operate to increase the speed of passage of the cooling or heating medium from the inlet to the outlet end of the cylinder whereby the entire width of the cylinder surface will be kept at a practi- 49 cally uniform temperature.

More specifically, the above -mentioned structure may take the form of a frusto-conical drum which has its larger end positioned adjacent the outlet of the cylinder and has associated therewith an expeller which facilitates the passage of the cooling or heating medium through the cylinder and also discharges the water of condensation therefrom when steam is used as a heating fluid.

50 The inventive idea involved is capable of receiving a variety of mechanical expressions, one of which, for purposes of illustration, is shown in the accompanying drawings, where- Figure l is a longitudinal section through a cylinder constructed in accordance with the invention Figure 2 is a transverse section on the line 22 of Figure 1;

Figure 3 is a similar section on the line of Figure l; and

Figure l is an enlarged fragmentary section of the cylinder.

As shown, the cylinder comprises a shell or body 5 closed at the inlet and outlet ends by the heads (Sand 7, respectively, which are welded or otherwise fixed in position during the assembly of the cylinder parts, and which are provided with the extensions 8 and 9 constituting trunnions for supporting the cylinder and having passages adapted for connection with a fluid supply system of the de-' sired character. The inner surface of the shell 5 is provided with circumferential corrugations 10 of a depth which will practically double the actual surface with which the cooling or heating medium comes in contact, thereby increasing the efliciency of the cylinder.

Before the heads 6' and 7 are secured in position, there is mounted within the shell 5 an inner drum 11, or its equivalent, of frustoconical formation and closed at both ends, the smaller end of the drum being disposed adjacent the inlet end of the cylinder. Said drum is centrally arranged in the shell and is secured, at its smaller end, to the inner surface of the shell by bars 12 extending across said end and having their extremities welded to said surface. \Vith the drum so disposed there is provided between the same and said shell an annular space which gradually decreases from the inlet end of the cylinder toward the head 7. By this arrangement, the fluid entering the cylinder from the inlet 8 at a constant volume is caused to flow around and along the drum at a constantly increasing speed and attains its highest velocity at the restricted annular space between the larger end of said drum and the shell 5. When a cooling liquid is employed, there isa tendency toward a slight increase in the temperature thereof during its passage through the cylinder. This tendency is, however, counteracted by the increase in the rapidity of flow'of the liquid and this increase also has the desired eifect of preventing not only the center of the cylinder from becoming heated, but also the portion thereof adjacent the outlet end where the speed of flow of the liquid is greatest. Thus the entire length of the cylinder is kept at a uniformly constant temperature whereby a maximum efliciency is obtained.

The invention provides further means for facilitating the passage of the liquid through the cylinder. This means is shown as comprising an expeller consisting of a plurality of curved blades 13 occupying the space between the larger end of the drum 11 and the head 7 and terminating at their inner ends in a passage 14 communicating with the outlet 9. When assembling the cylinder, the inner edges of the blades of the expeller are welded to the larger end of the drum and the outer ends of said blades are similarly secured to the inner surface of the shell 5, after which the head 7 is placed in position. With the cylinder rotating, the cooling or heating medium passing through the same enters the spaces between the blades 13 from the adjacent restricted passage between the drum and shell and is impelled by said blades to the center of the cylinder and thence outwardly through the passage 14 and outlet 9.

. With ordinary cylinders now in use, when prising steam is employed as a heating medium, it has been known that the same have become half filled with water of condensation, thus materially reducing the efiiciency thereof. The employment of an expeller, such as above described, has been found to eliminate this difliculty as the same will effectively operate to expel the condensate from the interior of the shell into the outlet 9.

What is claimed is:

1. A cylinder of the class described comprising a rotatable shell of uniform diameter throughout its length and adapted for direct contact by material to be treated, said shell having an inlet and an outlet, and a rotatable drum in said shell and spaced entirely therefrom and combining therewith to form an annular space of decreasing area extending from said inlet toward said outlet.

2. A cylinder of the class described comprising a rotatable shell having an inlet and an outlet, and a frusto-conical drum in'said shell rotatable therewith and having its smaller end adjacent said inlet and its other end spaced from said shell.

3. A cylinder of the class described coma rotatable shell having an inlet and an out et, a rotatable drum in said shell combining therewith to form an annular space of decreasing area extending from said inlet toward said outlet, and an expeller between said outlet and the adjacent end of said annular space.

4. A cylinder of the class described com prising a rotatable shell having an inlet and an outlet, a frusto-conical drum in said shell rotatable therewith and having its smaller end adjacent said inlet, and an expeller interposed between the larger end of said drum and said outlet.

5. A cylinder of the class described comprising a shell having an inlet and'an outlet, a drum in said shell combining therewith to form an annular space of decreasing area extending from said inlet toward said outlet, and an expeller between said outlet and the adjacent end of said annular space, said expeller including blades secured to said drum and shell.

6. A cylinder of the class described comprising a shell having an inlet and an outlet, a frusto-conical drum in said shell having its smaller end adjacent said inlet, and an expeller interposed between the larger end of said drum and said outlet, said expeller including blades having edges thereof secured to said drum and their ends to said shell.

7'. A cylinder of the class described comprising a shell having an inlet and an outlet and also provided with corrugations upon said shell having its smaller end adjacent said inlet, and an expeller interposed between the larger end of said drum and said outlet, said expeller including blades having edges thereolf1 sficured to said drum and their ends to said s e 8. A cylinder of the class described, comprising a rotatable shell having closed ends provided with trunnions in ,which inlet and outlet passages are formed, and a rotatable drum within said shell combining therewith to provide an annular space of decreasi area extending from said inlet toward sai outlet passage, the end of said drum adjacent tlfieulatter passage being spaced from said s e In testimony whereof I have aflixed my signature.

CHARLES W; MAYER.

its inner surface, a frusto-comcal drum in V 

